Adult Horse Nutrition Guide: Daily Feeding Basics for Maintenance and Work

Adult horses are designed to eat forage through much of the day. For most horses, hay or pasture should be the base of the ration, with concentrates added only when forage does not fully cover calorie or nutrient needs. AAEP guidance notes that many horses can do well on a forage-only diet for the work they do, and Merck emphasizes adjusting intake to maintain an appropriate body condition score rather than feeding the same amount year-round.

A practical starting point for a healthy adult horse is to feed forage at about 1.5% to 2% of body weight per day on a dry matter basis. For a 1,000-pound horse, that often works out to roughly 15 to 20 pounds of forage dry matter daily. If your horse is in moderate to heavy work, losing condition, or eating lower-quality forage, your vet may recommend adding a concentrate or ration balancer instead of increasing grain on your own.

Work level matters. Horses at maintenance or in light work may need little more than good forage, water, and salt. Horses in regular training often need extra digestible energy, and hardworking horses may need total intake closer to the upper end of normal dry matter intake. Merck notes that high-quality forage should still make up at least 50% of the ration for hardworking horses whenever possible.

Nutrition is not only about calories. Protein quality, vitamins, minerals, sodium, and water all matter. If you are feeding mostly hay, a ration balancer can help fill nutrient gaps without adding a large starch load. This can be especially helpful for easy keepers, horses on restricted pasture, or horses whose hay has not been tested.

A safe daily feeding plan starts with body weight, forage quality, and workload. Most adult horses should not go long stretches without forage, and abrupt feed changes raise the risk of digestive upset. As a rule of thumb, begin with about 1.5% to 2% of body weight per day in forage dry matter, then reassess every 1 to 2 weeks using body condition score, weight tape trends, manure, and performance.

For a 1,000-pound horse, that usually means about 15 to 20 pounds of forage dry matter daily. Total dry matter intake for many adults is around 2% of body weight, while Merck notes the theoretical maximum in 24 hours is about 3% to 3.5% of body weight. More is not always safer. Overfeeding can contribute to obesity, insulin dysregulation, and laminitis risk in some horses.

Concentrates should match need, not habit. If your horse maintains weight on hay or pasture, a low-intake ration balancer may be enough to cover vitamins, minerals, and amino acids. AAEP proceedings describe many lightly worked horses doing well with 1 to 2 pounds per day of a ration balancer for a 1,000-pound horse, while horses in frequent light exercise may need roughly 3 to 5 pounds per day of an appropriate concentrate, depending on forage quality and body condition.

Do not forget water and salt. Horses should always have access to clean water, and free-choice salt is recommended because forages are naturally low in sodium. Sweat losses rise with work and heat, so some horses need additional salt or electrolytes under your vet’s guidance. If your horse is dehydrated, refusing water, or working hard in hot weather, see your vet promptly before making major electrolyte changes.

A ration may need review if your horse is losing weight, gaining too much weight, dropping topline, acting dull during work, or leaving feed behind. Other clues include poor coat quality, recurrent loose manure, very dry manure, changes in drinking, or a sudden shift in attitude around feeding time. These signs do not point to one diagnosis, but they do suggest the current feeding plan may not match your horse’s needs.

Watch body condition closely. A horse that is ribby, weak over the topline, or struggling to hold weight may need more calories, better forage, dental evaluation, or medical workup. A horse that is getting cresty, developing fat pads, or becoming a very easy keeper may need calorie control and a lower nonstructural carbohydrate plan. Merck recommends adjusting intake to maintain an appropriate body condition score, often around 5 out of 9 for adult horses in maintenance.

See your vet sooner if you notice colic signs, reduced manure, diarrhea, choke, poor appetite, marked lethargy, heavy sweating with poor recovery, or sudden performance decline. Those are not routine nutrition issues until proven otherwise. Dental disease, ulcers, parasites, metabolic disease, pain, and other medical problems can all look like a feeding problem at first.

When in doubt, ask your vet to review the whole ration, including hay type, pasture access, concentrate amount by weight, supplements, salt, and water intake. A forage analysis and body condition score check can make feeding decisions much more precise than guessing by scoop size.

If your horse is healthy and maintaining weight, the safest foundation is usually good-quality forage, clean water, and free-choice salt. From there, your vet may suggest one of several options depending on your horse’s body condition and workload. A ration balancer is often a useful choice when hay covers calories but may not fully cover protein quality, vitamins, and minerals.

For horses needing more calories for work or weight maintenance, safer options often include increasing high-quality forage first, then adding a well-formulated concentrate in measured amounts. Some horses also benefit from higher-fat, lower-starch feeds rather than large grain meals. Feed should be weighed, not estimated by scoop, because volume can be misleading.

For easy keepers or horses with metabolic concerns, lower-sugar forage, slow feeders, controlled pasture time, and low-intake balancers may be more appropriate than traditional sweet feeds. Hay testing can help guide these choices. If your horse has dental disease, poor chewing, or trouble maintaining weight, soaked hay cubes, chopped forage, beet pulp, or complete feeds may be options to discuss with your vet.

If you are unsure where to start, a conservative and practical next step is to have your vet review your current ration and your horse’s body condition score before changing multiple things at once. Small, measured adjustments are usually safer than sudden overhauls.